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Full text of "The manufacture and properties of iron and steel"

418                         METALLURGY OP IRON AND STEEL.
The ultimate strength is regular, and this indicates that the metal is homogeneous, but minute imperfections give rise to the variations in the elongation, reduction of area, and elastic ratio. In the body of a casting these defects exert little influence, but they affect the integrity of a small machined piece. The safest way, whenever practicable, would be to make a drop test on a sample casting rather than to cut a small bar from the piece or from a separate coupon.